package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        if ("list".equals(action)){
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            String currentPage =req.getParameter("currentPage");
            if (currentPage == null){
                currentPage = "1";
            }
            int int_currentPageInt = Integer.parseInt(currentPage);

            User condition = new User(name, pass);

            //计算偏移量
            Page page = new Page();
            int pageSize = page.getPageSize();
            int offset = (int_currentPageInt - 1) * pageSize;

            page.setCurrentPage(int_currentPageInt);
            //计算总记录数
            int count = userService.count(condition);
            page.setTotalCount(count);
            page.setTotalPage();

            List<User> users = userService.findAll(condition,offset,pageSize);

            req.setAttribute("users",users);
            req.setAttribute("user", condition);
            req.setAttribute("page", page);
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
        }else if ("delete".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            // 根据id查询用户信息
            int result = userService.deleteUser(id);
            // 重定向到查询所有用户的页面
            resp.sendRedirect("user?action=list");
        }else if ("toUpdate".equals(action)){
            String sid = req.getParameter("id");
            Integer id = Integer.parseInt(sid);
            // 根据id查询用户信息
            User user = userService.findUserById(id);
            // 将查询到的用户信息存储到作用域中
            req.setAttribute("user", user);
            req.getRequestDispatcher("/update.jsp").forward(req, resp);
        }else if ("update".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id,name, pass));
            resp.sendRedirect("user?action=list");
        }else if ("add".equals(action)){
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(name, pass));
            resp.sendRedirect("user?action=list");
        }

    }
}
